Olympic organisers have played down concerns over the temperature inside the Aquatics Centre, saying they will make sure the recent heatwave does not make things too hot for competitors or spectators.

The London Organising Committee of the Olympic and Paralympic Games (Locog) was responding to fears from some national swimming coaches, who complained that the sweltering weather was making the interior of the centre and the water itself uncomfortably hot after the temperature around the pool deck reached 30C on Wednesday.

Following a meeting on Thursday yesterday with some representatives – including the Canada coach, Pierre Lafontaine – Locog said it had addressed the issue. A spokeswoman said the centre's temperature was maintained at the standard 27-28C for aquatics venues – one degree above the pool temperature – to ensure that athletes had the perfect performance conditions.

"The ambient temperature was one degree hotter than the target of just one degree above pool temperature on Wednesday due to the change in the weather," she said. "It got a lot hotter [so two degrees above rather than one], it was measured and the temperature turned down."

Spectators were warned in advance by email and in their ticket information that the temperature inside the venue was 27-28C and that they should dress accordingly and keep themselves hydrated, she added.

Although some teams are understood still to have concerns over the temperature in the centre, the British and US swimming teams shrugged off such worries.

Dave Richards, a spokesman for the GB swimming team, said the temperature wasn't an issue. "We as a team, both athletes and coaches, have not expressed any concerns over the water temperature at all," he said, adding that the ambient temperature "seems a little bit cooler than outside – but not in a bad way".

A spokeswoman for the US team was similarly unequivocal. "The swim team is fine with the temperature," she said. "We are just looking ahead to the competition."

Michael Phelps, the one of the greatest swimmers of all time and the winner of a record eight gold medals at Beijing, also appeared to be taking everything in his long stride. the American laughed off talk of records, pressure and fellow American rivals Ryan Lochte and Tyler Clary. "This is very exciting for me, being able to be back at the Olympics, being able to represent my country," he said. "You guys [the media] are the ones that keep bringing the medal count up. I've never once in my career said anything about medal counts."

He was in London, he added, for a simple reason: "To swim as fast as I can and if I do that, then that's all that matters and everything else will fall into place. The only person I can control is myself."